Architecture of vasa recta in the renal inner medulla of the desert rodent Dipodomys merriami: potential impact on the urine concentrating mechanism.

Architecture of vasa recta in the renal inner medulla of the desert rodent Dipodomys merriami: potential impact on the urine concentrating mechanism.
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沙漠啮齿动物 Dipodomys merriami 肾内髓质的直肠血管结构:对尿液浓缩机制的潜在影响。

DOI:
10.1152/ajpregu.00300.2012
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发表时间:
2012
期刊:
American journal of physiology. Regulatory, integrative and comparative physiology
影响因子:
--
通讯作者:
Pannabecker,ThomasL
Pannabecker,ThomasL
中科院分区:
--
文献类型:
--
作者:
Issaian,Tadeh;Urity,VinooB;Dantzler,WilliamH;Pannabecker,ThomasL

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我们假设,袋鼠 Dipodomys merriami(一种沙漠啮齿动物,其尿液浓度超过 6,000 mosmol/kg H2O)的内髓质提供了产生高浓缩尿液所需的结构特征的独特示例。为了研究这种结构,通过免疫荧光和组织切片的数字重建来评估外内髓的内髓血管段。表达尿素转运蛋白 UT-B 和水通道水通道蛋白 1 的下降直肠血管 (DVR) 位于集合管 (CD) 组的外围,这些集合管在下降过程中穿过内髓质合并。升直血管 (AVR) 位于 CD 组的内部和外部。当 DVR 沿内髓质下降时,它们以均匀的速率从维管束上剥离,并进入与有组织的 CD 簇相关的 AVR 网络。这些 AVR 形成间质节点空间,每个空间由一个 CD、两个 AVR 和一个或多个上升细肢或预弯曲段组成,这种结构可能导致尿液浓缩机制所必需的溶质分隔和液体流动。尽管我们已经发现了一些明显的差异,但在我们的分析水平上,袋鼠大鼠内髓质的管状血管结构与慕尼黑 Wistar 大鼠的管状血管结构非常相似。需要更详细的研究来确定种间功能差异。
We hypothesize that the inner medulla of the kangaroo ratDipodomys merriami, a desert rodent that concentrates its urine to over 6,000 mosmol/kg H2O, provides unique examples of architectural features necessary for production of highly concentrated urine. To investigate this architecture, inner medullary vascular segments in the outer inner medulla were assessed with immunofluorescence and digital reconstructions from tissue sections. Descending vasa recta (DVR) expressing the urea transporter UT-B and the water channel aquaporin 1 lie at the periphery of groups of collecting ducts (CDs) that coalesce in their descent through the inner medulla. Ascending vasa recta (AVR) lie inside and outside groups of CDs. DVR peel away from vascular bundles at a uniform rate as they descend the inner medulla, and feed into networks of AVR that are associated with organized clusters of CDs. These AVR form interstitial nodal spaces, with each space composed of a single CD, two AVR, and one or more ascending thin limbs or prebend segments, an architecture that may lead to solute compartmentation and fluid fluxes essential to the urine concentrating mechanism. Although we have identified several apparent differences, the tubulovascular architecture of the kangaroo rat inner medulla is remarkably similar to that of the Munich Wistar rat at the level of our analyses. More detailed studies are required for identifying interspecies functional differences.
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